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On the simultaneous emission and absorption of rays of the same definite refrangibility; : being a translation of a portion of a paper by M. Léon Foucault, and of a paper [On Fraunhofer's lines]
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Jean Bernard Léon Foucault letter to J. Regnauld
Manuscripts
This letter by Foucault was written in Liverpool (on British Association for the Advancement of Science letterhead). The letter is written in French and addressed to "Mer ami" but the name on the envelope is "J. Regnauld" in Paris.
mssHM 72099
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Additional observations tending to investigate the symptoms of the variable emission of the light and heat of the sun; : with trials to set aside darkening glasses, by transmitting the solar rays through liquids; and a few remarks to remove objections that might be made against some of the arguments contained in the former paper
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487000:0119:44